Ramune is a carbonated soft drink that originated in Japan and is widely consumed in Tokyo. It comes in a distinctive glass bottle with a marble stopper. To open the bottle, you need to push the marble down into the neck of the bottle, creating a unique popping sound. Ramune comes in various flavors, such as original, strawberry, melon, and lychee. It is a fun and fizzy drink that is popular among both locals and tourists.